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Fluids drag question

  1. Jun 6, 2009 #1
    1. The problem statement, all variables and given/known data

    A 0.3m diameter cork ball (density 210kg/m^3) is tied to an object on the bottom of a river as is shown in fig B3. The weight of the cable and the drag on it can be neglected. Assume the water viscosity u is 1.12x10^-3 Ns/M^2 and the water density p is 1000kg/m^3, and the acceleration of gravity is 10ms^-2. Estimate the speed of the river current.


    2. Relevant equations

    Cd=(2Fd)/(pV^2A)

    3. The attempt at a solution

    I can calculate the tension of the cable and then find the Fd force but dont know how to apply it to find the velocity because I dont know what Cd is? There is an equation where Cd=24.0/Re but i dont see how i can use that either. please help?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
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